python协程和线程的差异

Python (192) 2023-05-16 07:37:02

1、差异说明

实现多任务时,线程切换从系统层面远不止保存和恢复CPU上下文这么简单。操作系统为了程序运行的高效性,每个线程都有自己缓存Cache等数据,操作系统还会帮你做这些数据的恢复工作。所以线程的切换非常耗性能。

协程的切换只是单纯的操作CPU的上下文,一秒钟切换个上百万次系统都可以。

2、实例

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复制到剪贴板
在新窗口中打开代码
EnlighterJS 3 Syntax Highlighter
importtime
defwork1():
whileTrue:
print("----work1---")
yield
time.sleep(0.5)
defwork2():
whileTrue:
print("----work2---")
yield
time.sleep(0.5)
defmain():
w1=work1()
w2=work2()
whileTrue:
next(w1)
next(w2)
if__name__=="__main__":
main()
----work1---
----work2---
----work1---
----work2---
----work1---
----work2---
----work1---
----work2---
----work1---
----work2---
----work1---
----work2---
...省略...
importtime defwork1(): whileTrue: print("----work1---") yield time.sleep(0.5) defwork2(): whileTrue: print("----work2---") yield time.sleep(0.5) defmain(): w1=work1() w2=work2() whileTrue: next(w1) next(w2) if__name__=="__main__": main() ----work1--- ----work2--- ----work1--- ----work2--- ----work1--- ----work2--- ----work1--- ----work2--- ----work1--- ----work2--- ----work1--- ----work2--- ...省略...
importtime
defwork1():
whileTrue:
print("----work1---")
yield
time.sleep(0.5)
defwork2():
whileTrue:
print("----work2---")
yield
time.sleep(0.5)
defmain():
w1=work1()
w2=work2()
whileTrue:
next(w1)
next(w2)
if__name__=="__main__":
main()

----work1---
----work2---
----work1---
----work2---
----work1---
----work2---
----work1---
----work2---
----work1---
----work2---
----work1---
----work2---
...省略...

以上就是python协程和线程的差异,希望对大家有所帮助。

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